Gearing for transmission of rotary motion.



F. H. ROYCE.

GEARING FOR TRANSMISSION OF ROTARY MOTION.

APPLIGATIOR FILED JUNE 24, 1913.

1,088,241 Patented Feb. 24, 191 1 F I6. I

FIG. 2.

WITNESSES IN-VENTOR W RHRoyce.

in: A tun-neg UNITED STATES PATENT orrron.

r'nnnnnrqx HENRY novels, or DERBY, ENGLAnp.

GEARING FORTRANSMISSION ROTARY MOTION.-

Specificationot Letters Patent.

Patented nch. 24. 1914'.

Application filed June 24, 1913. Serial No. 775,498.

To all whom it may concern Be it known that I, FREDERICK HENRY Korea, a subject of the King of Great Britain and Ireland, residing at Nightingale Road, Osmaston Road, Derby, inthe county for the has for its object the eliminatlon of certain forms of irregular angular velocity or torque in the driven element of such gearing.

According to the present invention, a spring or elastic bufier drive and a springcontrolled frictional damper are both interposed between the driving and driven elements of the gearing, the construction and arrangement of said devices being such that the Spring or elastic bufl'er drive is strong enough to transmit the whole of the rotary.

motion, the spring-controlled frictional damper being insufiicient to transmit said rotary motion, and that the two devices function independently, that is to say, each performs the function it is designed to perform independently of the other.

In the transmission of rotary motion from prime movers, rotary vibrations are frequently set up in the transmission shafts or parts when such shafts or parts have a natural elasticity in a rotary direction. These vibrations arise from the variations in angular velocity or torque which occur during each revolution and are found more particularly when the driven part includes a member of appreciable inertia. For the purpose of eliminating or diminishing these variations in angular velocity or torque, a spring or elastic bufier drive has sometimes been employed, but in many cases the effect of this is that the relative rotary movement which consequently occurs between the driving and driven members of the transmissionsystem develops into objectionable periodic or synchronous rotary vibrations. By the present invention the transference of irregularities in angular velocity or torque between said members is completely or partially prevented, and any slight remaining irregularities of angular velocity or torque are prevented from developing into periodic or synchronous rotary vibrations.

In the accompanying drawing, which illustrates this invention :--F1gure- 1 is a section .taken in two different planes, the r ght hand half thereof being taken on the line w-w of Fig. 2, and the, left hand half belng taken on the line 41 -2). Fig. 2 is a view partly in elevation and part in section the left hand half thereofbeing a section on the line w-a: of Fig. 1,-

Throughout the views similar parts are marked with like letters of reference.

The shaft 0: has four outwardly projecting radial lugs a which are preferably equally spaced. The gear wheel 12 from or to which is transmitted the rotary movement of the shaft a has its boss I) made 'of annular boxlike form and has its ends closedb y plates p and This boss carries within it four lugs b which project inwardly and alternate with the lugs a Interposed between the lugs a and b are spring or elastic buffers 0 which are stiff enough to transmit the whole of the drive. Mounted on the shaft a by means of castellations a? formed on its external circumference are a series of friction disks d, and mounted in a similar manner on castellations 12 formed on the internal circumference-of the boss b of the wheel I) are a series of friction disks 6 which alternate with the disks d. These friction disks are kept in contact with one another by means of a spring f which operates between a specially shaped end friction disk f and the end cover plate .1). The strength of the spring f is considerably less than that of the elastic or buffer drive so that it does not transmit any part of the drive and allows the device to function purely as a vibration damper. The other end friction disk f is suitably strengthened and contacts one side of the lugs 11 and the other cover plate 19 contacts the other side of the lugs 12. The lugs a are made slightly narrower than the lugs so that they are free to move in a r0- tary direction independent of the gear wheel I) and its box-like boss.

The mechanism is operativein either direction, that is to say, the rotary motion can be transmitted from the shaft (1' to the gear wheel I) or vice versa, the drive being taken through the lugs a and b and through the spring or elastic buffers c, the said spring or elastic bufi'ers allowing the driven member to move relatively to the driving member in a rotary direction about its axis within certain limits, but these relative rotary movenation of a spring or elastic bufi'er drive and.

a spring-controlled frictional damper both interposed between the driving'and driven elements of the said gearing and capable of functioning independently of one another.

2. In a gearing for transmitting rotary motion, the combination of a driving member having a series of radiall arranged lugs or projections, a driven mem er having a series of radially arranged lugs or projections arranged to alternate with the lugs or projections carried by the driving member, springs or elastic buffers located and acting between the said two series of lugs or projections, two series of alternately arranged friction disks connected respectively to the driving and driven member, and spring-controlled means for creating and reserving frictional contact between said dis rs.

3. -In a gearing for transmitting rotary motion, the combination of a transmitting member, an annular member carried by said transmittin member, a series of inwardly projecting lugs carried by said annular member, a second transmitting member, a

series of outwardly projecting lugs carried by said second transmitting member, spring or elastic buflers interposed between the said two series of lugs, a series of friction disks carried by each of the transmitting members, those carried by one alternating with those carried by the other, and a spring operating to keep the two series of disks in frictional contact, as and for the purpose set forth.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

FREDERICK HENRY ROYCE.

Witnesses:

ALAN BRODRICK, P. G. Enmorr. 

